Sight device for print mounting



Ml e/7Z0!" K. KETZSCHER SIGHT DEVICE FOR PRINT MOUNTING Flled July 6, 1928 Sept. 1,-1931.

Patented Sept. l, 1931 warren stares l KURT irnrzscrrnn, or nnaLrn-Tnnrnr-rror, GERMANY SIGHT DE'VFEE 1 R PRZN f1 IJIOUNTING Application filed July 6, 1928, Serial No. 296,782, and in Germany January 30, 1928.

The present invention relates to an adjusting device or color rotographic for deep-print mounting.

@ne of themost important problems in the art of rotographic printing by means ofcolore is the so called mounting of the individual colors. If the other colors :are not e2: ctly matched to or. adjusted after the first color, then a distorted product wilhbe 1 obtained. The mounting is hitherto carried out in difierent ways, but not one of the processes hitherto known is fast working, nor do the elder processes give exact and precise products. The mounting may for instance he carried out by mounting the blue form exactly by means of the gauge sheet. Of this mounting a copy is prepared and on this copy all edges of the pictures are cut out. This stencil serves as a mounting model, for instance for red and yellow colors. Besides the changes to which the paper is subjected during the heating when being copied-distortions in the illustration or picture will always occur during the manual cutting of the edges and during other stages of treatment. It has therefore been proposed'to mechanize the mounting of the colors by means of several mounting devices. The known devices of this kind are equipped with mechanisms by means of which the first mounting, after exact adjustment, is securely fixed; The fix ing may for instance be carried out'by means of rails or the like. Thereupon the second mounting is placed upon the first one and is adjusted relatively to the same through openings or apertures in the rails, whereby adjusting crosses on both color sets are brought into mutual correspondence. Exact products can however not be carried out by means of this procedure and a final control of the registering of the colors can only be carried out in the printing machine, wherefore a new cylinder must be prepared if only a single color in a single picture is not in registry.

The object of the present invention is to provide a simple device by means of which a fully-exact registering of the difi'erent colors may be secured in an easy manner. 5: A constructional form of the invention is shown by way of an example in the accompanyingdrawings, in which Fig. l is a longitudinal central section and I Fig.2 is a plan View ofthe adjusting dev ce. The device consists of a simple tube a of relatively small diameter. The tube is pref erably'formed from a light metal and the interior of'the same may be blackened, or dark-cole-red. The lower end ofthe tube a is'open and is preferably equipped with a disc 6 of cast iron, brass or the like having 7 a central opening. On account of the disc I) the device can stand safely. The lower sur-" face of the disc I) may partly be covered by a rubber plate a? in order to prevent the color films from being scratched. The upper closed end of the tube is equipped with a small aperture 0.

As will be seen from the Figures 1 and 2 the device is adjacent its lower end equipped with four uniformly spaced needles 6 of which eachjis spaced from the adjacent nee dles e by an angle of The needles are arranged in a restricted part b of the central opening in the disc 6. When the device is adjusted over a register cross, the needlese" will form extensions of this cross. Hereby the adjusting of the device is highly facilitated, in that the needles 6 are brought into reg 80 ister with the arms of the adjusting cross.

In order to prevent damage of the color films or the lass discs carrying the same if the device by change should be titled over an annularcushion f of rubber or the like is ar 8 ranged on the tube (Fig. 1).

The mounting of the colors takes place in the following manner: The blue form may as usual be adjusted after a gauge sheet. Si multaneously With the preparation of the color sets a registering cross is photographed on each original. This cross will of course in each set be located on exactly the same spot. When the blue mounting has been prepared a glass plate is placed on the same and the mounting of the red color is commenced. Hereby the plates of the diiferent'pictures are placed one upon the other. After a coarse adjustment of the red plate on the blue plate the device a isplaced on the registering cross of the red plate. When looking through the small aperture in the tube the eye will look in a vertical direction. Hereby it becomes possible to adjust the red picture exactly relatively to the blue one. The subsequent pictures are treated in the same manner. On the red mounting for instance the yellow mounting may be prepared. In the practise it will however be simpler to immediately remove the red mounting for copying and to prepare the yellow mounting over the blue one.

By means of the new device the registering can be easily and speedily carried out. The elder methods were complicated but did nevertheless not giveexact results.

I claim:

1. An adjusting device for the mounting of colored deep-prints or rotographic prints, comprising a simple substantially cylindrical tube, which at its upper closed end is equipped with a small central opening, and elements arranged adjacent the lower open end of said tube and adapted to cooperate and register with the arms of a registering cross on a printing plate.

2. An adjusting device for the mounting of colored deep-prints or rotographic prints, comprising a simple tube which is closed at one end and open at its other end, there being a. snmll. central opening in the closed end of the tube, elements arranged adjacent the open end and adapted to cooperate and register with the arms of a registering cross on a printing plate, a stand plate iorthe said tube and a layerof a resilient substance on said plate.

'3. An adjusting device for the mounting of colored deep-prints or rotographic prints, comprising a simple tube which is closed at one end and open at its other end, there being a, small central opening in the closedend of the tube, a plurality of needles, adjacent the open end of the tube and arranged at an angular distance of from each other with their ends defining the four corners of a square, a stand plate for the said tube and a layer of a resilient substance on said plate, said four'needles being adapted to register as extensions of the arms of a registering cross on a printing plate.

Signed at. Berlin, Germany. in the county of Brandenburg and Fit te of Prussia this 11th day of June A. D. 1928.

KURT KETZSCHER. 

